<template>
  <div>
    <!--面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图区-->
    <el-card>
      <!--头部警告提示区-->
      <el-alert
        show-icon
        title="注意:只允许在   第三段分类设置相关参数!"
        type="warning" close-text="知道了">
      </el-alert>

      <!--选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            clearable
            @change="handleChanged()"></el-cascader>
        </el-col>
      </el-row>

      <!-------tabs页签区-------->
      <el-tabs v-model="activeName" @tab-click="handleTabClick()">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <!--添加动态参数的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!---展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item,i) in scope.
                row.attr_vals" :key="i" closable size="medium" @close="handleClose(i, scope.row)">{{item}}
                </el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加的按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!---索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <!--添加静态属性的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <!--静态参数表格-->
          <el-table :data="onlyTableData" border stripe>
            <!---展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item,i) in scope.
                row.attr_vals" :key="i" closable size="medium" @close="handleClose(i, scope.row)">{{item}}
                </el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加的按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!---索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>

      <!--添加参数的对话框-->
      <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="30%"
        @close="addDialogClosed()">
        <!--添加参数的对话框-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name" clearable></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams()">确 定</el-button>
  </span>
      </el-dialog>

      <!--修改参数的对话框-->
      <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="30%"
        @close="editDialogClosed()">
        <!--修改参数的表单-->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name" clearable></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams()">确 定</el-button>
  </span>
      </el-dialog>

    </el-card>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],

      // 被激活的页签的名称
      activeName: 'many',

      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],

      // 控制添加对话框的显示和隐藏
      addDialogVisible: false,

      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },

      // 添加参数验证规则
      addFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }]
      },

      // 控制编辑修改对话框的显示和隐藏
      editDialogVisible: false,

      editForm: {},

      // 编辑参数验证规则
      editFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }]
      }

    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      } else {
        // 把数据列表赋值给catelist
        this.catelist = res.data
        // console.log(this.catelist)
      }
    },

    // 级联选择框选中变化,会触发这个函数
    handleChanged () {
      this.getParamsData()
    },

    // Tabs页签点击事件的处理函数
    handleTabClick () {
      console.log(this.activeName)
      // 调用获取参数列表数据的函数
      this.getParamsData()
    },

    // 获取参数列表的数据
    async getParamsData () {
      console.log(this.selectedCateKeys)
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证明所选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的id  和当前所处的面板获取对应的参数
      const { data: res } = await this.$http
        .get(`categories/${this.cateId}}/attributes`,
          { params: { sel: this.activeName } })

      if (res.meta.status !== 200) {
        if (this.selectedCateKeys.length === 0) {
          return this.$message.warning('请选择第三级商品分类')
        } else {
          return this.$message.error('获取参数列表失败')
        }
      }
      // console.log(res.data)

      // 把从服务器返回数据中res.data中attr_vals字符串进行遍历分割后的变为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals
          ? item.attr_vals.split(' ') : []
          // 控制文本框的显示和隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })

      console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },

    // 监听关闭添加参数对话框事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },

    // 点击编辑图标,展示修改的对话框
    async showEditDialog (id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        this.$message.error('获取参数信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },

    // 监听关闭编辑参数对话框事件
    editDialogClosed () {
      // 找到Ref的引用,调用resetFields()
      this.$refs.editFormRef.resetFields()
    },

    // 编辑参数-->确定提交  处理函数
    editParams () {
      // 提交之前对表单数据进行预验证
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http
          .put(`categories/${this.cateId}/attributes/
          ${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
        if (res.meta.status !== 200) {
          this.$message.error('更新参数失败')
          this.editDialogVisible = false
        } else {
          this.$message.success('更新参数成功')
          await this.getParamsData()
          this.editDialogVisible = false
        }
      })
    },

    // 添加参数确定按钮提交
    addParams () {
      // 提交之前对表单数据进行预验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}
        /attributes`,
        {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 201) {
          this.$message.error('提交参数失败')
        }
        this.$message.success('提交参数成功')
        this.addDialogVisible = false
        await this.getParamsData()
      })
    },

    // 删除
    async removeParams (id) {
      // 删除弹窗提示确认框
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?',
        '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
        return err
      })
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }

      // 删除的业务逻辑
      const { data: res } = await this.$http
        .delete(`categories/${this.cateId}/attributes/${id}`)
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      } else {
        this.$message.success('删除参数成功!')
        this.editDialogVisible = false
        await this.getParamsData()
      }
    },

    // 文本框失去焦点后者按下Enter都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 用户输入了真实的数据,需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      await this.saveAttrvals(row)
    },

    async saveAttrvals(row) {
      // 需要发起请求,保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }

      this.$message.success('修改参数项成功！')
    },

    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick  方法的作用:当页面上元素被重新渲染之后才会
      // 执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },

    // 删除对应的参数可选项
    async handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      await this.saveAttrvals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用,返回true,否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },

    // 当前选中的三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },

    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }

}
</script>

<style lang="less">
  .cat_opt {
    margin: 15px 0;
  }

  .el-cascader {
    width: 300px;
    margin-left: 15px;
    padding: 10px;
  }

  .el-tag {
    margin: 10px;
  }

</style>
